参数资料
| 型号： | AD8420ARMZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | IC AMP INSTR RR 2.5KHZ 8MSOP |
| 标准包装： | 1,000 |
| 放大器类型： | 仪表 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 1 V/µs |
| -3db带宽： | 250kHz |
| 电流 - 输入偏压： | 20nA |
| 电压 - 输入偏移： | 250µV |
| 电流 - 电源： | 85µA |
| 电流 - 输出 / 通道： | 10mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 36 V，±2.7 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
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Data Sheet
AD8420
Rev. 0 | Page 25 of 28
CLASSIC BRIDGE CIRCUIT
a classic resistive bridge. This circuit works in dual-supply mode or
single-supply mode. Typically, the same voltage that powers the
instrumentation amplifier excites the bridge. Connecting the
bottom of the bridge to the negative supply of the instrumentation
amplifier sets up an input common-mode voltage that is located
midway between the supply voltages. The voltage on the REF pin
can be varied to suit the application. For example, the REF pin
is tied to the VREF pin of an analog-to-digital converter (ADC)
whose input range is (VREF ± VIN). With an available output swing
maximum programmable gain is simply this output range divided
by the input range.
+VS
–VS
0.1F
VOUT
VREF
VDIFF
AD8420
09
945
-069
Figure 70. Classic Bridge Circuit
4 mA TO 20 mA SINGLE-SUPPLY RECEIVER
The 80 μA maximum supply current, input range that goes
below ground, and low drift characteristics make the AD8420 a
very good candidate for use in a 4 mA to 20 mA loop. Figure 71
shows how a signal from a 4 mA to 20 mA transducer can be
interfaced to the AD8420. The signal from a 4 mA to 20 mA
transducer is single-ended, which initially suggests the need for
a simple shunt resistor to ground to convert the current to a voltage.
However, any line resistance in the return path (to the transducer)
adds a current-dependent offset error; therefore, the current must
be sensed differentially.
In this example, a 5 Ω shunt resistor generates a differential voltage
at the inputs of the AD8420 between 20 mV (for 4 mA in) and
100 mV (for 20 mA in) with a very low common-mode value.
With the gain resistors shown, the AD8420 amplifies the 100 mV
input voltage by a factor of 40 to 4.0 V.
09
94
5-
07
3
AD627
LINE
IMPEDANCE
4mA TO 20mA
5
4mA TO 20mA
TRANSDUCER
R2 = 97.6k
R1 = 2.49k
0.1F
5V
AD8420
R2
R1
G = 40
POWER
SUPPLY
+
–
+
–
0.8V TO 4.0V
Figure 71. 4 mA to 20 mA Receiver Circuit
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| AD8428BRZ | IC OPAMP INST 3.5MHZ LN 8SOIC |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8420ARMZ-RL | 功能描述:IC AMP INSTR RR 2.5KHZ 8MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.11 V/µs 增益带宽积:350kHz -3db带宽:- 电流 - 输入偏压:4nA 电压 - 输入偏移:20µV 电流 - 电源:260µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:带卷 (TR) |
| AD8420BRMZ | 制造商:AD 制造商全称:Analog Devices 功能描述:Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier |
| AD8420BRMZ-R7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier |
| AD8420BRMZ-RL | 制造商:AD 制造商全称:Analog Devices 功能描述:Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier |
| AD8421 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 nV/√Hz, Low Power |
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